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Title: Multi annual variability and climatic signal analysis of sunshine duration at a large urban ara of Mediterranean
Alternative title / Subtitle: (Athens)
Authors: Φουντά, Δήμητρα
Καλημέρης, Αναστάσιος
Πιέρρος, Φραγκίσκος
Item type: Journal article
Keywords: Πολυετή μεταβλητότητα;Κλιματική ανάλυση;Ηλιοφάνεια;Μεσόγειο;Ελλάδα;Multi-annual variability;Climate analysis;Sunny;Mediterranean;Greece
Subjects: Ecology
Solar energy
Ηλιακή ενέργεια
Issue Date: 15-May-2015
Publisher: Elsevier
Abstract: This study analyses the interannual variability of sunshine duration (SDU) at the urban area of Athens from 1897 to 2011. Observations of total cloud cover (TCC) are also used for a better interpretation of SDU variations. The annual SDU in Athens has increased by +8% (+19 h/decade) over the past century, mainly due to increase in the summer and spring SDU, however, distinct sub periods with decreasing and increasing trends are also discerned. SDU in Athens has undergone an abrupt increase during 1940s with early 1950s being the brightest period of the record. For long periods the course of SDU mirrors TCC, indicating a strong negative correlation between the two variables, nevertheless during the last three decades, both variables reveal trends of the same sign (more evident in spring). Under all-sky conditions, annual SDU decreased by approximately 7% from 1950s to 1980s and increased by 3% thereafter. Under clear sky conditions, the increase of SDU after 1980s is larger, amounting to 9%. Singular spectrum analysis and Continuous Wavelet Transform indicated significant non-linear trends of SDU and an intermittent oscillation, centered at 2.9–3.0 yrs.
Language: English
Citation: Founda, D., Kalimeris, A. and Pierros, F. (2014) Multi annual variability and climatic signal analysis of sunshine duration at a large urban ara of Mediterranean: (Athens). Urban Climate, 10 (5). pp.815-830.
Journal: Urban Climate
Type of Journal: With a review process (peer review)
Access scheme: Embargo
License: Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες
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